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"Optical dating" typically refers to OSL and IRSL, but not TL.

All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.

Optical dating is a rapidly developing technique, used primarily in the dating of sediments deposited in the last 500,000 or more years.

As such increasing numbers of Quaternary geologists, physical geographers, archaeologists, and anthropologists are now relying on the results produced.

These slowly decay over time and the ionizing radiation they produce is absorbed by other constituents of the soil sediments such as quartz and feldspar.

Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating.

All sediments and soils contain trace amounts of radioactive isotopes including uranium, thorium, rubidium and potassium.

The measurement of radionuclides present within the surrounding sediment can be calculated either by in-situ gamma spectrometry or high-resolution gamma spectrometry in the laboratory to identify the annual Dose Rate (Dr) of ionising radiation, Gy kyr-1, after which the age of the sample can be calculated using the equation: Estimated age = De/Dr This equation very simply expresses the calculations necessary, but it is important to be aware of the factors influencing the two values used.

Heterogeneous sediments and radioactive disequilibria will increase errors on Dr, while incomplete bleaching of the sample prior to burial, anomalous fading in feldspars, and the estimation of past sediment moisture content may all also add to increased errors.

An Introduction to Optical Dating The Dating of Quaternary Sediments by the Use of Photon-stimulated Luminescence , .

An Introduction to Optical Dating The Dating of Quaternary Sediments by the Use of Photon-stimulated Luminescence . An Introduction to Optical Dating The Dating of Quaternary Sediments by the Use of Photon-stimulated Luminescence, , , , , , An Introduction to Optical Dating The Dating of Quaternary Sediments by the Use of Photon-stimulated Luminescence.




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